May fades to gray

The coast will be lucky to see brief afternoon clearing this weekend, National Weather Service forecaster Noel Isla said. Highs should be in the 60s.

Low clouds and fog should reach the inland valleys, too, but the sun is expected to make more of an appearance there. Highs should be in the mid-70s.

There's a slight chance of afternoon thunderstorms in the mountains Friday and Saturday, but the biggest threat is dry lightning. Little or no rain is expected to make it to the ground. Mountain highs should be in the 70s.

The deserts will be far removed from the coastal clouds, and highs there should be around 100 degrees.

No big changes in the weather pattern are expected early next week, but forecasters say the low clouds and fog should thin Monday, and that should allow a little more sunshine at the beaches.

A persistent marine layer has kept Lindbergh Field, San Diego's official weather station, on the cool side recently. The temperature at the airport has not gone above 67 degrees since May 20.